// RUN: %clang_cc1 -verify %s int foo() { int x[2]; // expected-note 4 {{array 'x' declared here}} int y[2]; // expected-note 2 {{array 'y' declared here}} int z[1]; // expected-note {{array 'z' declared here}} int w[1][1]; // expected-note {{array 'w' declared here}} int v[1][1][1]; // expected-note {{array 'v' declared here}} int *p = &y[2]; // no-warning (void) sizeof(x[2]); // no-warning y[2] = 2; // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}} z[1] = 'x'; // expected-warning {{array index 1 is past the end of the array (which contains 1 element)}} w[0][2] = 0; // expected-warning {{array index 2 is past the end of the array (which contains 1 element)}} v[0][0][2] = 0; // expected-warning {{array index 2 is past the end of the array (which contains 1 element)}} return x[2] + // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}} y[-1] + // expected-warning {{array index -1 is before the beginning of the array}} x[sizeof(x)] + // expected-warning {{array index 8 is past the end of the array (which contains 2 elements)}} x[sizeof(x) / sizeof(x[0])] + // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}} x[sizeof(x) / sizeof(x[0]) - 1] + // no-warning x[sizeof(x[2])]; // expected-warning {{array index 4 is past the end of the array (which contains 2 elements)}} } // This code example tests that -Warray-bounds works with arrays that // are template parameters. template <char *sz> class Qux { bool test() { return sz[0] == 'a'; } }; void f1(int a[1]) { int val = a[3]; // no warning for function argumnet } void f2(const int (&a)[2]) { // expected-note {{declared here}} int val = a[3]; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}} } void test() { struct { int a[0]; } s2; s2.a[3] = 0; // no warning for 0-sized array union { short a[2]; // expected-note 4 {{declared here}} char c[4]; } u; u.a[3] = 1; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}} u.c[3] = 1; // no warning short *p = &u.a[2]; // no warning p = &u.a[3]; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}} *(&u.a[2]) = 1; // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}} *(&u.a[3]) = 1; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}} *(&u.c[3]) = 1; // no warning const int const_subscript = 3; int array[2]; // expected-note {{declared here}} array[const_subscript] = 0; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}} int *ptr; ptr[3] = 0; // no warning for pointer references int array2[] = { 0, 1, 2 }; // expected-note 2 {{declared here}} array2[3] = 0; // expected-warning {{array index 3 is past the end of the array (which contains 3 elements)}} array2[2+2] = 0; // expected-warning {{array index 4 is past the end of the array (which contains 3 elements)}} const char *str1 = "foo"; char c1 = str1[5]; // no warning for pointers const char str2[] = "foo"; // expected-note {{declared here}} char c2 = str2[5]; // expected-warning {{array index 5 is past the end of the array (which contains 4 elements)}} int (*array_ptr)[2]; (*array_ptr)[3] = 1; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}} } template <int I> struct S { char arr[I]; // expected-note 2 {{declared here}} }; template <int I> void f() { S<3> s; s.arr[4] = 0; // expected-warning {{array index 4 is past the end of the array (which contains 3 elements)}} s.arr[I] = 0; // expected-warning {{array index 5 is past the end of the array (which contains 3 elements)}} } void test_templates() { f<5>(); // expected-note {{in instantiation}} } #define SIZE 10 #define ARR_IN_MACRO(flag, arr, idx) flag ? arr[idx] : 1 int test_no_warn_macro_unreachable() { int arr[SIZE]; // expected-note {{array 'arr' declared here}} return ARR_IN_MACRO(0, arr, SIZE) + // no-warning ARR_IN_MACRO(1, arr, SIZE); // expected-warning{{array index 10 is past the end of the array (which contains 10 elements)}} } // This exhibited an assertion failure for a 32-bit build of Clang. int test_pr9240() { short array[100]; // expected-note {{array 'array' declared here}} return array[(unsigned long long) 100]; // expected-warning {{array index 100 is past the end of the array (which contains 100 elements)}} } // PR 9284 - a template parameter can cause an array bounds access to be // infeasible. template <bool extendArray> void pr9284() { int arr[3 + (extendArray ? 1 : 0)]; if (extendArray) arr[3] = 42; // no-warning } template <bool extendArray> void pr9284b() { int arr[3 + (extendArray ? 1 : 0)]; // expected-note {{array 'arr' declared here}} if (!extendArray) arr[3] = 42; // expected-warning{{array index 3 is past the end of the array (which contains 3 elements)}} } void test_pr9284() { pr9284<true>(); pr9284<false>(); pr9284b<true>(); pr9284b<false>(); // expected-note{{in instantiation of function template specialization 'pr9284b<false>' requested here}} } int test_pr9296() { int array[2]; return array[true]; // no-warning } int test_sizeof_as_condition(int flag) { int arr[2] = { 0, 0 }; // expected-note {{array 'arr' declared here}} if (flag) return sizeof(char) != sizeof(char) ? arr[2] : arr[1]; return sizeof(char) == sizeof(char) ? arr[2] : arr[1]; // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}} } void test_switch() { switch (4) { case 1: { int arr[2]; arr[2] = 1; // no-warning break; } case 4: { int arr[2]; // expected-note {{array 'arr' declared here}} arr[2] = 1; // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}} break; } default: { int arr[2]; arr[2] = 1; // no-warning break; } } } // Test nested switch statements. enum enumA { enumA_A, enumA_B, enumA_C, enumA_D, enumA_E }; enum enumB { enumB_X, enumB_Y, enumB_Z }; static enum enumB myVal = enumB_X; void test_nested_switch() { switch (enumA_E) { // expected-warning {{no case matching constant}} switch (myVal) { // expected-warning {{enumeration values 'enumB_X' and 'enumB_Z' not handled in switch}} case enumB_Y: ; } } } // Test that if all the values of an enum covered, that the 'default' branch // is unreachable. enum Values { A, B, C, D }; void test_all_enums_covered(enum Values v) { int x[2]; switch (v) { case A: return; case B: return; case C: return; case D: return; } x[2] = 0; // no-warning } namespace tailpad { struct foo { char c1[1]; // expected-note {{declared here}} int x; char c2[1]; }; class baz { public: char c1[1]; // expected-note {{declared here}} int x; char c2[1]; }; char bar(struct foo *F, baz *B) { return F->c1[3] + // expected-warning {{array index 3 is past the end of the array (which contains 1 element)}} F->c2[3] + // no warning, foo could have tail padding allocated. B->c1[3] + // expected-warning {{array index 3 is past the end of the array (which contains 1 element)}} B->c2[3]; // no warning, baz could have tail padding allocated. } } namespace metaprogramming { #define ONE 1 struct foo { char c[ONE]; }; // expected-note {{declared here}} template <int N> struct bar { char c[N]; }; // expected-note {{declared here}} char test(foo *F, bar<1> *B) { return F->c[3] + // expected-warning {{array index 3 is past the end of the array (which contains 1 element)}} B->c[3]; // expected-warning {{array index 3 is past the end of the array (which contains 1 element)}} } } void bar(int x) {} int test_more() { int foo[5]; // expected-note 5 {{array 'foo' declared here}} bar(foo[5]); // expected-warning {{array index 5 is past the end of the array (which contains 5 elements)}} ++foo[5]; // expected-warning {{array index 5 is past the end of the array (which contains 5 elements)}} if (foo[6]) // expected-warning {{array index 6 is past the end of the array (which contains 5 elements)}} return --foo[6]; // expected-warning {{array index 6 is past the end of the array (which contains 5 elements)}} else return foo[5]; // expected-warning {{array index 5 is past the end of the array (which contains 5 elements)}} } void test_pr10771() { double foo[4096]; // expected-note {{array 'foo' declared here}} ((char*)foo)[sizeof(foo) - 1] = '\0'; // no-warning *(((char*)foo) + sizeof(foo) - 1) = '\0'; // no-warning ((char*)foo)[sizeof(foo)] = '\0'; // expected-warning {{array index 32768 is past the end of the array (which contains 32768 elements)}} // TODO: This should probably warn, too. *(((char*)foo) + sizeof(foo)) = '\0'; // no-warning } int test_pr11007_aux(const char * restrict, ...); // Test checking with varargs. void test_pr11007() { double a[5]; // expected-note {{array 'a' declared here}} test_pr11007_aux("foo", a[1000]); // expected-warning {{array index 1000 is past the end of the array}} } void test_rdar10916006(void) { int a[128]; // expected-note {{array 'a' declared here}} a[(unsigned char)'\xA1'] = 1; // expected-warning {{array index 161 is past the end of the array}} }